Improvement in pressure-gage and safety-valve



A. A. KENT.

Pressure Gage.

No. 103.893. v Patenfed June 7, I870.

UNITED STATES PATENT OFFICE.

ARTEMAS A. KENT, OF LYONS, IOWA.

IMPROVEMENT IN PRESSURE-GAGE AND SAFETY-VALVE.

Specification forming part of Letters Patent No. 103,893, dated June 7,1870.

To all whom it may concern:-

Be it known that I, A. A. KENT, of Lyons, in the county of. Clinton andState of Iowa, have invented a new and useful Improvement in CombinedPressure-Indicator and Safety- Valve; and I do declare that thefollowing is a true and accurate description thereof, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon, and being a part of this specification, in which- Figure 1 is avertical longitudinal section of 'my device, and Fig. 2 is a plan of theelastic disk.

Like letters indicate like part in each figure.

The nature of this invention relates to the construction of a combinedsafety-valve and pressure-indicator.

It consists in the peculiar arrangement of an elastic flexible diskWithin a suitable case, on which disk the pressure is exerted andcounteracted by a spring on the upper side of the disk, coiled about astem bearing on the disk, said stein having pivoted to it anindicatingarm, which, in its upward movement raises the valve bystriking a tappet adjustably secured on its stem, as more fullyhereinafter shown and set forth.

In the drawings, A represents the stand pipe of my safety-valve, flangedor threaded in its lower part, so that it may be secured to apressure-generator. It is provided with a branch, A, on the end of whichis seated the safety-valveB. Apassage, d,isforn1ed through thestand-pipe, branching off at d to the seat of the safety-valve. The topof the stand-pipe is countersunk, forming a cup-shaped recess, 0, inwhich is laid a flexible disk, D, secured in place by a cup-shaped cap,E, screwed over the top of the stand-pipe. The disk is composed of lightsheet-rubber packing, strengthened by light metallic segments a, securedto its upper surface, which allow it to expand or vibrate freely,thereby permitting the use of a lighter and more flexible disk thanwould otherwise be the case, and very sensitive in the varying pressureto which it may be subjected.

F is a case surmounting the stand-pipe.

G is a stem passing through the cap E, pressing by its head g on thedisk D.

ff are lugs in the case, and H a spring coiled about the stem Gbetween'its head and the lugs f, pressing theformer down on the disk.

B is the stem of the safety-valve, sustained in position by pressingthrough a guide projecting from the upper part of the case, and a lightsemi-elliptic spring, K, the free end of which presses down on the headof the stem.

I is a tappet adjustable vertically on the valve-stem.

J is an indicator-lever pivoted to the stem G, its longer arm projectingthrough an opening in the side of the case, and has a slot, h, in itsshorter arm engaging with a stud, i, in the case. The edge of the caseWhere the lever J projects is laid off to a scale. The operation ofthedevice may be explained as follows: As pressure is developed in thegenerator it is exerted against the under side of the disk, pressingupthe stem G, which in turn raises the long arm of the indicator-lever,the pressure being indicated by the projecting end of the lever on thescale. The tappet I is adjusted on the valve-stem to any desired pointon the scale, and as soon as that pressure is attained or exceeded thelever J strikes the tappet, by which the safety-valve is raised and thepressure relieved through the opening at the outer end of the passagesd. The peculiar construction of the disk, rendering it very sensitiveand quick in its action, is especially valuable in vnlcanizing apparatusand in situations where accuracy and celerity of action in thesafety-valve are essential.

What I claim as my invention, and desire to secure by Letters Patent,is-- The stand-pipe A, passages dd, disk D, cap E, spring H, stem G,indicator-lever J, case F, provided with a suitable scale, safety-valveB, valve-stem B, and adjustabletappet I, the whole arranged andoperating substantially as described, and for the purpose set forth.-

ARTEMAS A. KEN T,

Witnesses J. N. BENTON, N. CANNY.

